Refrigerant recovery, purification and recharging system and met

Details Refrigerant recovery, purification and recharging system and met Refrigerant recovery, purification and recharging system and met

1991-09-10

1992-12-22

Sollecito, John

Refrigeration

Automatic control

Withdrawing or adding refrigerant from or to normally closed...

62292, 62 77, F25B 4500

Patent

active

051725622

ABSTRACT:
In a combined recovery, purification and recharging system, a refrigerant compressor has an inlet coupled to a recovery control valve for connection to a refrigeration system under service from which refrigerant is to be recovered, purified and recharged into the system. The compressor outlet is connected to a first port of a refrigerant storage container. A filter for removing contaminants from refrigerant is coupled to a circulation control valve for selectively circulating refrigerant in a closed path during a purification cycle from a second port of the container through the filter back to the first port of the container. A vacuum pump is coupled to a vacuum control valve for selective connection to the refrigeration system under service during a vacuum cycle for evacuating the system under service to atmosphere. A pressure sensor is connected to the vacuum pump for automatically terminating vacuum pump operation when pressure in the system under service is below a preselected low-pressure threshold. The purification cycle may be initiated either automatically upon initiation of a vacuum cycle, or by an operator independently of the vacuum cycle. A recharging control valve is coupled to the second port of the refrigerant storage container for selectively feeding fresh refrigerant from the storage container to the refrigeration system under service during a recharging cycle.

REFERENCES:
patent: 4441330 (1984-04-01), Lower et al.
patent: 4470265 (1984-09-01), Correia

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